From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758216Ab3K0W3x (ORCPT ); Wed, 27 Nov 2013 17:29:53 -0500 Received: from mail.skyhub.de ([78.46.96.112]:46204 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757486Ab3K0W3w (ORCPT ); Wed, 27 Nov 2013 17:29:52 -0500 Date: Wed, 27 Nov 2013 23:29:44 +0100 From: Borislav Petkov To: "H. Peter Anvin" Cc: Linus Torvalds , Andy Lutomirski , Andi Kleen , Linux Kernel Mailing List , Ingo Molnar , Andi Kleen , Thomas Gleixner Subject: Re: [PATCH] Add a text_poke syscall v2 Message-ID: <20131127222944.GB748@pd.tnic> References: <1385426236-14960-1-git-send-email-andi@firstfloor.org> <5294F10C.8060901@amacapital.net> <52964EC7.9000504@zytor.com> <52966C0A.7070201@zytor.com> <20131127222104.GA748@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 27, 2013 at 02:25:29PM -0800, H. Peter Anvin wrote: > Actually the CPUID is superfluous on anything than the executing CPU > since IRET is serializing. Why not on the executing core too? We're IRET-ting there too. Which would mean that a dummy empty syscall would be enough too since we need the serialization only. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --